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Characterization of Potassium-Selective Field Effect Transistors Based on 1,3-(di-4-oxabutanol)-Calix[4]arene-Crown-5 as Ionophore

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The ionophore 1,3-(di-4-oxabutanol)-calix[4]arene-crown-5 has been synthesized and used in order to develop a plasticized poly(vinyl-chloride) membrane for potassium ion detection using ion-selective field-effect transistors (ISFETs). The composition of the polymeric membrane was optimized with respect to the plasticizer being used, with the best response obtained using bis(2-ethylhexyl)sebacate. The developed MEMFETs exhibit a good linear response of 52.4 ± 1.6 mV per decade within the concentration range of 2.0 × 10−4 M to 1.0 × 10−1 M and response time of 30 seconds. The detection limit was determined to be 4 × 10−5 M and also the selectivity coefficients for possible interfering cations/anions were evaluated. The MEMFETs are suitable for use in the pH range of 3–11.
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Keywords: CALIX[4]ARENE; ISFET; MEMFET; POTASSIUM

Document Type: Research Article

Publication date: October 1, 2009

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